Otto f



0. F. PERSSON.

PUMP AND STRAINE'R THEREFOR.

. APPLICATION FILED DEC. 5,1918. 1,306,621.

Patented J 11110 10, 1919.

ms mamas PETERS cu. Pun-04.1mm. WAsNmcrmv. n. c.

UNITED STATES PATE T OFFICE.

o'r'ro F. rienssoiv, or Earn, PENNSYLVANIA, ASSI GNdR To Gamma nnno'rnlc i COMPANY, A conronarron. or new YORK. V

' PUMP AND STRAINER rniinnron To all whom it may concern 7 Be it known that I, Orro F. PnRssoN, a citizen of the United States, residing at Erie, in the county ofErie, State of Pennsylvania, have invented certain new and useful Improvements in Pumps and Strainers Therefor, of which thefollowing is a specification. I Y

The present invention relates to pumps, particularly to pumps in connection with which a strainer is used to strain the liquid being handled, and has for its object to provide an improved arrangement of pump and strainer wherein the strainer is deand quickly removed and replaced again in position.

In some applications, pumps may be placed in very inaccessible positions, and in such cases it is highly desirable that the strainer be arranged so it may be very quickly removed and replaced again in position with the least amount of trouble and without the operator having to see what he is doing. Such an occasion occurs for example in the case of a pump used as an oil pump for an internal combustion engine, and the structure illustrated in the drawing and hereinafter described is more particularly intended for this purpose, although as is obvious the invention may be utilized wherever found practicable.

For a consideration of what I believe to be novel and my invention, attention is directed to the accompanying description and the claims appended thereto.

In the drawing Figure 1 is a view partly in section of a structure embodying my invention, and Fig. 2 is a section taken at right angles to Fig. 1.

Referring to the drawing, 5 indicates a pump casing provided with an open bottom having a cover 6 which is suitably fastened to casing 5, a gasket 6 being provided to insure a tight joint. Projecting from the upper side of easing 5 is a body member 7 provided with a flange 8 by means of which the pump may be bolted or otherwise fastened to a support as indicated at 9. In body member 7 are two parallel longitudinally extending openings 10 and 11 in which are shafts 12 and 13, the shaft 12 being a driving shaft and having coupled to it a shaft 14 for giving turning movements Specification of Letters Patent.

bolts 1 23.

Patented 'J une 10,1919.

I Application filed December 5, 1918. Serial No.26'5,404.

theretoi Shafts 12 and l bear at their lower ends on cover6 and carry'meshing gears 15 and 16. In cover. 6 1s a suctlon opening 17'and in the top of casing 5 is a discharge opening .18, the suction opening- 1 being on one side of the gear wheels and thendischarge opening on the other side. vThe foregoing forms a type ofl gear pump,

the operation of which is well understood. It's characteristic feature is that all bear- 'ings for the shafts 12 and 13 are arranged above the bottom of the pump casing so as to leave the bottom free to have the strainer attached thereto. tachably attached to the pump casing in such manner that it can be very readlly The strainer comprises a shallow rectangular casing 20, the bottom of which, is

formed of a piece, of suitable strainingmain place by a frame-22 between which and ,the strainercasing the edges .of the screen are held. Frame 22 is fixed in position by The strainer casing 20 is provided on its upper side with a discharge opening 24 surrounded by a .roundedboss 25 and the suction opening 17 is shaped to receive boss 25 as clearly shown in Fig. 1. On the top of strainer. casing 20:1t about the central portions of its longitudinal edges are two projections 26 having fiat top surfaces which engage against the bottom of a plate 27 formed integral with and projecting'from the side of casing 5. Adjacent the flat surfaces of projections 26 are flanges 26 which serve to hold the strainer casing from lateral movement. Formed integral with casing 5 and plate 27 are two inclined strengthening ribs 28 provided with knobs or hooks 29. The strainer is held in position by a spring member in the form of a spring wire which is bent to provide two inwardly facing ends 31 which engage in openings 32 in the opposite sides of strainer casing 20, a cross-piece 33 which hooks over knobs 29, and two U-shaped side members 34 which form the resilient part of the spring.

With the above arrangement it will be seen that the strainer has a three point contact with the pump casing-so it can always take a position in firm engagement therewith and in which the rounded base 25 fits closely into opening 17. The engaging parts, therefore, need not be finished with great accuracy to insure a good fit of boss 25 in suction opening 17 for a slight tilting will not affect such fit as is obvious. To remove the strainer from the pump casing it is only necessary to lift the spring from engagement with knobs 29 when the strainer can be freed by a downward movement and a lateral movement sufficient to free the spring from plate 27. The strainer can be put back into place quickly by an operation the reverse of that for removing it, at which time the cross-piece of the spring will automatically slide up the inclined edges of ribs 28 and snap over the knobs 29. The side members 34 of the spring are thus put under tension.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof, but I desire to have it understood that the apparatus shown-is only illustrative, and thatthe invention can be carried out by other means.

WVhat I claim as new and desire to secure by Letters Patent of the United States, is

1. The combination with a pump having a suction opening in its base, of a strainer which engages the base at three points and a spring for detachably holding the strainer in engagement with the base.

2. The combination with a pump having a smooth bottom with a suction opening therein, of a strainer having a discharge opening surrounded by a boss which fits into said opening, projections on the top of said strainer which engage the bottom of the pump, and spring means detaehably connecting the strainer and pump together.

3. The combination with a pump having a smooth bottom with a suction opening therein, of a strainer having a discharge opening, one of said openings being surrounded by a boss which fits into the other, projections on the top of said strainer which engage the bottom of the pump, and a spring pivoted to said strainer and yieldingly en gaging said pump to hold the strainer and pump together.

4. The combination with a pump having a bottom with a suction opening therein, of a strainer having a discharge opening, one of said openings being surrounded by a rounded boss which fits into the other opening, a

member pro ecting from the pump casing between which and the strainer there are two points of contact, means forming knobs on the pump casing, and a spring carried by the strainer and detachably engaging said knobs to hold the strainer in position on the pump.

5. The combination with a pum having a suction opening in its bottom and an inclined surface with a holding means thereon, of a strainer adapted to engage the bot tom of the pump, and a Ushaped holding spring which is carried by the strainer and is adapted to slide up said inclined surface into engagement with said holding means.

In witness whereof, I'have hereunto set my hand this 2 day of December 1918.

OTTO F. PERSSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

